Stark Effect Spectroscopy of Mono- and Few-Layer MoS2

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• 作者：J. Klein ; J. Wierzbowski ; A. Regler ; J. Becker ; F. Heimbach ; K. Müller ; M. Kaniber ; J. J. Finley
• 刊名：Nano Letters
• 出版年：2016
• 出版时间：March 9, 2016
• 年：2016
• 卷：16
• 期：3
• 页码：1554-1559
• 全文大小：406K
• ISSN：1530-6992

文摘

We demonstrate electrical control of the A-exciton interband transition in mono- and few-layer MoS₂ crystals embedded into photocapacitor devices via the DC Stark effect. Electric field-dependent low-temperature photoluminescence spectroscopy reveals a significant tuneability of the A-exciton transition energy up to ∼16 meV from which we extract the mean DC exciton polarizability ⟨β̅_N⟩ = (0.58 ± 0.25) × 10^–8 Dm V^–1. The exciton polarizability is shown to be layer-independent, indicating a strong localization of both electron and hole wave functions in each individual layer.